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You may find this article of value, I did.

I just posted a comment about the use of CVNs (Card Verification Numbers). When they were first introduced, they confused people, but now some research I have seen shows that not asking for it can lead consumers to wonder if they are on a real site.

Often, these new features are launched to much fanfare, go through a period of doubt, then at some point usually after the pundits have moved on, they actually matter.